Re: matrix algebra

*To*: mathgroup at smc.vnet.net*Subject*: [mg3724] Re: [mg3683] matrix algebra*From*: garciajb at ucunix.san.uc.edu (Juan Garcia Velo)*Date*: Thu, 11 Apr 1996 02:51:56 -0400*Organization*: Aerospace Engineering, U. of Cincinnati*Sender*: owner-wri-mathgroup at wolfram.com

In article <4ka52b$sai at dragonfly.wolfram.com>, Robert Pratt <rpratt at math.unc.edu> wrote: >Sometimes partitioned matrices are called block matrices, and that's what >Mma calls them. Check out BlockMatrix in the standard package >LinearAlgebra`MatrixManipulation` > I did. Thanks for your help. The problem is that it is very cumbersome to work with it, until you actually define what the partitions are. For instance, if you say a=BlockMatrix[{c,d},{e,f}], without saying what c,d,e, and f are, you get a=AppendColumns[AppendRows[c,d],AppendRows[e,f]]. If you define some more partitioned matrices and then you, say, multiply them, you don't get the results in the form of a partitioned matrix, but as AppendColumns[...].AppendCols... etc. until, again, you actually define the partitions as matrices. Not exactly the way I'd like it, because it would be extremely difficult to see any result this way. Juan -- Juan Garcia-Velo garciajb at ucunix.san.uc.edu Aerospace Engineering, ML 70 University of Cincinnati My .sig file does not accurately Cincinnati, OH 45221, USA reflect the owner's creativity. ==== [MESSAGE SEPARATOR] ====